I know this is partly inspired by Pink Floyd, but here's why I'm going to buy it (other than it looks AWESOME):

I love music, and the three notes coming out of two notes at the top reminds me of "hemiola" where three notes are played under two notes (e.g. two eighth notes above an eighth note triplet). One of the most beautiful examples of that is in Philip Glass' song "Opening" on the track Glassworks. The album has a prism on the front cover and is in that sense very similar to the Pink Floyd cover.

Anyway the hemiola motif/glassworks/pink floyd'ness just make this one of my favorite tees.

By the way you owe it to yourself to check out "Opening" on Glassworks by Philip Glass: